At least eight persons were killed and over 20 wounded when a gas cylinder exploded in a scrap warehouse in Pakistan Thursday, police said. A son of the owner of the warehouse was also among the dead in the explosion that took place in the thickly populated Misri Shah area of Lahore city. Lahore police chief Malik Iqbal told the reporters that five persons were killed in the cylinder explosion. The warehouse owner said that gas started leaking from a cylinder when his workers were busy cutting it. It caused the explosion. An eyewitness Sheikh Imtiaz said that the warehouse suddenly came down due to the explosion.